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55 Threads found on edaboard.com: Digital Pid
Hi , or Hi Mr. Peter (tpetar), I have PIC18F45k22 with DAC MCP4922, I need to design a feedback controller for my INverter 12V Dc to out put of max 9v peak AC 50Hz, sinewave, I use LC filters and at the output to make read by PICMICROPIC 18f45k22 at AN2 channel , I use feedback gain of =0.1 and a noninverting level shifter my circuit I a
What is key step to learn it? in analog and digital - - - Updated - - - Most popular - temperature control. I made a soldering station with pid alghorithm. Work perfect for 2 years already. Also, control speed of motor and positioning for linear and rotary drivers. Hello,
hello i am intersted in referrnce and books on building control systems ( closed loop pid , fuzzy , ....) for motors and such in industrial product , and i need some books to RE-UNDERSTAND the theory and practical implementation in "digital" microcontroller regards
A digital filter wil also require a clock, so there will always be some latency
pid is simply multiplications and additions. In a digital system it's a little more complicated because you need to convert your continuous function to a discrete-time one. There's lots of stuff on the web, I mean LOTS, about how to do this.
Hello master's i have a temperature controller from TAIE manufacturer and model is FU-400-101-00B which having communication facility using RS-485. but to set the temperature and get pid action from this pid controller whaich are commands we need to send to this model. if any one did work on this or such kind of pid controller then plz hel
The equations suggest a general time discrete second order system using the controllable canonical form. But it's not implemented in the code, M1 and M2 aren't calculated. new_duty should be set from controller output uk. Technically, variable types, number ranges and parameter scaling matters. This details can't be seen from your code. P.S.:
Generally speeaking, a "digital" (time-discrete) integrator is an accumulator, adding the input signal at a fixed sample frequency.
Time discrete pid implementation can be done by applying z-transformation, or in other words converting the continuous differential equations to difference equation. You'll find tables of equavalent z-domain pid parameters in any digital control text book, here's the basic concept
It's not clear, if you are describing proportional behaviour (the duty cycle is set to a value according to voltage error) or integral behaviour (the duty cycle is increased or decreased each time step according to voltage error). But you should try the behaviour of both algorithms in a simulation. You'll notice that neither a pure P (not reachi
pls., anyone tell me how to model the digital pid controller for obtaining const.current for operating laser diode
The +3 after the percentage error figure means plus 3 counts. In other words there's an uncertainty of 3 in the last digit of the display. Oh, I just looked at the 15B's specifications on Fluke's web site
The out of integral item will overflow. Only in certain situations. Do you understand when it's the case? Any real integrator has a limit. It should be also implemented in a digital controller, saturation rather than wrap around. There are different methods to implement anti-windup in digital controllers.
While implementing pid controller on FPGA 1.how does Ti effect digital implementation? it the loop time.If so what is reset wind up time? 3.Does it determine reset windup value ?
hi all i'm new in microcontrollers field i want some one to tell me about where can i find tutorials about MICROCONTROLLERS BASED pid digital CONTROL USING C PROGRAMMING...thankyou in advance Here are some examples that might be useful to
Can anybody please share / comment what kind of questions are expected related to the following topics? Memories Synthesis digital fundamentals timing Fifo Clock crossing domain Flip flops Latch and ff Thanks for any help
but i need a pid controller which can take any universal input
hello,i am doing a project on digital pid controller using pic16f716.can anyone provide me the code for it.
Discrete? or digital? digital pid have advantage to easy and independently change constant pid. May be integrated in master-slave or multi-levels system. No drift or thermal variation. If sampling frequency is not enough (minim twice fastest component) will be poor performance.
Hello everyone, I am assigned to work on this micro-controller based control of the process. I am given the transfer function and the process variables values. I started on programming using C language, based on the pid values. but i couldn't understand how to implement the process transfer function in micro-controller.
I don't think you are going to be able to synthesize integration or differentiation. What I THINK you want is a digital pid controller, right? To do this, you need to convert your equations into discrete-time forms (z-transforms, and such). An FPGA can only operate on sampled signals, so talking about 'integrals' or 'derivatives' is a little mis
Respected Members, I have tried to simulate the classical buck-boost regulator in simulink with pid control but it is not working as it should be. So I need some assistance in this regard. I have downloaded the buck regulator with pid from mathworks it is working fine and the boost is also working fine, but the buck-boost i have made is not wor
hi, first a cuestion... how are you planning to implement the pid algortihm??? do you have something in mind? remember that a digital implementation is different than the analogic way... 1. say I=1 and your integral part is 45 and the actual error is -160. instead of decrementing down to -115 the integral part, must be limited to 0... if the er
Will a high quality multimeter like this Fluke 289 True-rms Industrial Logging Multimeter with TrendCapture do?
hi any one who know about how to design the digital pid controller using counter method pls give path how to do that.
Dear Engineers: I have asked to do a simulink matlab simulation for some continuous and digital pid controller methods. Can any one help me to find some simulink file for these methods. Thanks
Hi, I am new in the subject of Feedback control system. Our teacher has assigned us a project of Robotic arm with digital pid controller. We have 7-8 months to submit this project and our group consist of 4 members. I want to ask from where should I start this project, what are the pre-requiste that I must know before making this project. I want
i am designing a loss in weight system and i need to implement a filter for the weightsignal and a good pid algo to create a quick response this needs to be done in pascal. does anybody have experience in this field.
hello all i'm working on embedded c coding, so in my application i have tio implement the digital pid control for output current of Boost DC-DC converter. so please provide some information on 1. how to calculate the pid parameters. 2. sample 'c' code to implement pid control digitally for output (...)
hey ppl I am planning to implement digital pid on Spartan-3e...dunno where to start from...help!!!
hi i have started a project on self balancing of plate mounted inverted pendulum mean a pendulum would be directly attached with the motor shaft through plate or pulley. we have to use a digital pid controller but i dont know how to design a digital pid although i have a bit knowledge of analogue pid and i (...)
Hi everybody, My project is MPPT for solar panel but in my project I have to use digital pid controller to controlbrightness(use lrd control ). My input voltage is 5VDC. By using buck converter and pid controller I want to regulate the output voltage to an desirable value (this value is alternate, of course). This is my code: #include (...)
hi everyone. i write code use pid digital control brightness (when sunlight in photosynthesis to turn off the lights,when dark >> light ) but i see program program does not run properly .EVERYONE HELP ME: #include <16f877a.h> #include #device *=16 ADC=10 #FUSES NOWDT, HS, NOPUT, NOPROTECT, NODEBUG, NOBROWNOUT, NOLVP, NOCPD, NOWR
digital system is more flexible, because it's easier to adjust its parameters. Here's a rule of thumb. If the rate of your digital control loop is 20-30 times the bandwidth of your plant (or greater), then you can apply the same analysis to the digital system as if it were analog.
Here is a digital pid algorithm
If anybody can tell me how to measure the speed or rpm of a DC MOTOR. if i m giveing the digital pid controller output to PWM and then driving DC MOTOR TO CONTROL SPEED.now i am stuck at giving back the feedback to the controller. i have few ideas: :idea:1. use LDR and LED circuit to measure pulses generated at diffent frequecy and use fre
Hi, I have a problem...about analog and digital value. signed value and unsigned value... How to implement pid controller by TI LF2704EVM DAC&ADC? (DAC:12-bit,ADC:10-bit) Someone can give me the code? Thanks all. my e-mail:
Hello; I have a project entitled "design and implementation of a programmable logic controller based digital proportional-integral-derivative controller". I don't know from where to start , so anyone who can help me with documentation papers or anything useful will be great.
Hi. I need Help about digital system implementation. I plain develop a digital controller for a temperature control system. I have some problems with control times. I use sample time of 100us, I read an ADC even 100us. My problem is know when I must applicate the output (input signal procesed with a pid ) to the plant. Regards.
I agree with rikie_rizza; if one needs high sensivity, accuracy and to include some control algorithms (such as pid for example) it is better to build digital control. However, digital ones (with microcontroller) have some drawbacks. The microcontroller may hung-up or software may go out of control if there is an error that has not been (...)
hi, i have never inplemented pid in FPGA, but I have done this in PLC so think that if you understand about digital pid you can do it in any devices.
Hi, has any body developed digital pid in a 8bit microcontroller, If yes then please send me the code of this pid What do you have in mind with 'digital pid'? I have no clue :cry: ep20k
Function work and cost are always the main considerations. Basic digital control chip (pid type) in nowadays takes more chip area than analog comtroller. Besides, adc and digital digital PWM resolution and delay are the other constrains for digital design. However, digital control can do (...)
i think it is better to design pid by digital Athimetic than you design a CPU. Because CPU is in seccession.
Every body. I really need "Rapid Prototyping of digital Systems (Paperback)" book. I heard it was in but it was moved. Pleasssssssssssssssssssssssssss. mail:
Hi I think that the difficulty is on digital pid, how to make digital pid equation. I sugges you read some books about digital control. For programing with PIC, you can find some articles on the site: Best regards Muoinho
guys (jgx, river78), 1. you need to learn digital hw design 2. you need to learn vhdl, and how to use it to describe hw And I dont think, a forum can be of much help to you in getting right from scratch to the end. Its simply not that simple. But of course during your learning curve, you may find a lot of help here. There is one more option.
i need your cpld suggestions for reading mpeg packets from digital satellite tuner. actually the task is very easy but i need speed. - the tuner gives me 8 bit paralel data, clock and packet start output. - every packet starts with hex47 and next 2 bytes identifies the packet.(pid) - every data packet is 188 bytes total. so now i have to
I want to control the rpm of a brushless motor with ESC(Electronic speed controller) using pid codes in PIC. Suppose my motor is rotating at 2000 rpm detecting using hall sensor setup.Now I want it to run at 5000 rpm.The speed will be controlled by PWM signals generated by PWM module( 16-bit) in PIC hardware which is fed to ESC. How am I gonna us
As far as I know, there is only one standard form for implementing differentiators and integrators. But in digital control, we usually find the overall transfer function, then use the inverse Z-transform to get the difference equations. what are the methods of differentiation ( for e.g. D = e-e or e-2+e, etc.)